Top drawing roll on spinning machine



Jan 25, 1955 w. NAEGELI TOP DRAWING ROLL O N SPINNING MACHINE FiledSept. 24, 1948 United States Patent Tor DRAWING ROLL oN SPINNING MACHINEWerner Naegeli, Winterthur, Switzerland, assignor to ActiengesellschaftJoh. Jacob Rieter & Cie, Winterthur, Switzerland Application September24, 1948, Serial No. 51,090

Claims priority, application Switzerland June 1S, 1948 18 Claims. (Cl.A19--142) My presen-t invention relates to improvements in topdrawing-rolls on spinning machines, running on antifriction-bearings. ln

Such rolls usually comprise an axle carrying antifriction-bearings atboth ends, which bearings support sleeves having an elastic covering' ofcloth and leather, rubber or some other material of similar properties.Such covering is subject to wear.

The yarn causes corrugations, wrinkles or other unevenness on thesurface of the covering, so that the latter must be reground from timeto time. Thehantifriction-bearings of the sleeves must be periodicallychecked. The sleeves and their covering, therefore, must be demountedfrom time to time from their axle journals. Such demounting has to bedone readily and easily and without impairing the hold of thesleeve onthe bearing.

lt h-as been proposed to circumferentially groove the middle of thesleeve so as to produce axial or thrust stops for the bearings. v

When, in operation, one conventional top roll is winding yarn, theantifriction-bearing of the other top roll is set askew and the sleevewill readily loose its axial hold. -It wanders oit in a lateraldirection, and the covering will :be damaged. Such loose sleevesreadilyI drop on the floor upon demounting lthe top-nell pair from thedraw-head. This increases the work of attendance, results in loss oftime and, eventually, in serious `interruptions of operation. Further,due to the relatively large clearance or play between the sleeve mountand the antifictionJbearing, there results a substantial lateral wear ofthe annular sleeve groove so that the latter eventually has to bereplaced. Conventional sleeves, having a circumferential groove atmidlength, are, expensive to manufacture and lrequire very accuratemachining.

In order to eliminate the aforedescribed drawbacks, disadvantages andinconveniences, the top roll sleeveon which the covering is secured-issecurely held in place, according to the present invention, on the outerrace of the antifriction bearing by a radial pressure action produced byutilizing the elastici-ty of the topdroll material. The pressure actionis advantageously derived from the resilience of the sleeve covering,but also may be derived from resilient parts or portions of the sleeve,e. g. from resilient longitudinal webs provided on the latter.

Various forms of my present invention are shown, by way of example, inthe accompanying drawing, in which:

Fig. 1 shows a first example, a pair of top rolls in elevation, with oneroll in axial section,

Fig. 2 is a cross-section of one of the rolls in Fig. 1,

Fig. 3 shows a modified sleeve of a top rol-l in axial section,

Fig. 4 illustrates a further example of a top roll in axial section.

Fig. 5 is a longitudinal sectional view vof a fourth modication of a toproll according to the invention.

ln the first example (Figs. 1, 2), the two top rolls 1 areinterconnected by an axle 2 which has a journal in the form of a pin 3(shown partly by dash lines) at each end, the pins tting tightly intocorresponding axial bores at the ends of shaft 2. The inner race of theantifriction bearing 4 is rigidly mounted on each journal 3. Each toproll 1 comprises a roll shell including a metallic thin-wall sleeve 6which has an end wall on the side opposite to the axle 2. The sleeve 6is longitudinally slotted at 5 in its intermediate portion, and carriesa suitable elastic coverice ing 7 forming a unitary body with the sleeve6. The inside diameter of the covering is slightly less than the outside-diameter ofthe sleeve 6 so that the mounted covering exerts a radialpressure onto, i. e. is concentrically acting on the sleeve 6, as shownby the arrows in Fig. 2. The resilient webs 8 present between thelongitudinal slot 5 in sleeve 6, therefore, are pushed inwardly and,thus, clampingly engage the outer race of the bearing 4. lnwardlypointing lugs 9, provided at one end of the longitudinal slots 5, formaxial or thrust stops for the outer race of the bearing 4.

For the purpose of protecting the `bearing 4 from dust, the interior ofsleeve 6 is closed at the end through which axle 2 extends, by a ring orcollar 10 shrunk onto the latter. When the bearing 4 is a one-row ballbearing, the -top rollers may swing slightly about their center at anangle to the radial center plane of the bearings, which movement is veryadvantageous in the spinning operation.

In the example sh-own in Fig. 3, longitudinal tongues or strips 16 areformed by longitudinally slitting the wall of the sleeve 26, and thefree ends of the: tongues are bent inwardly. When mounting the top rollonto the axle 2, the Vtongues 16-due to the conical configuration of aportion of the bearing body 17are temporarily urged into the yieldingcovering 7. When the top roll has been properly mounted, the lfree endsof the tongues 16 are engaged in an annular groove 18 in the rollerbearing 17 which is thereby axially locked in position.

ln all described forms of the top rolls, the resiliency ci the covering7 on the sleeve is utilised. Cloth, leather, cork, rubber andsynthetically produced substances having similar properties areparticularly suitable materials for the covering.

However, it is also possible to hold the top roll on the antifrictionbearing merely lby means of the resiliency of the sleeve alone. For thispurpose, in the example shown in Fig. 4, the sleeve 19 is provided withwebs 29 extending longitudinally thereof, which webs are formed byslitting the sleeve, and merge at both ends int-o the material of thesleeve. The webs 20 are cambered somewhat inwardly in their longitudinalsection. The arrangement is such that when the webs 20 are deformed, incourse of being mounted on a roller bearing, the elastic limit of thematerial of the webs is not exceeded, so that, when the top roller hasbeen completely fitted on, the webs return to their original form andconstitute stops on one side of the roller bearing 4. On the other side,the roller bearing 4 abuts against inwardly directed abutments 14 in thesleeve 19.

lt is further possible, as shown in Fig. 5, to lock the sleeve 19 on theouter ring of a roller bearing 21 by means of the resiliency of thematerial of which the sleeve is made. To such end, a plurality or"bulges 22 are pressed into the sleeve 19' in the region of the roller.bearingZL the said bulges constituting together, when seen in section,an undulating line extending in the axial direction of the sleeve 19.Alternatively, the construction may be such that the bulges 22 are :notimmediately juxtaposed, but are formed by spaced impressions. The insidediameter of the annular bulges 22 is somewhat smaller than the outsidediameter of the bearing 21 so that the bulges 22, in the mountedcondition of the sleeve 19 which carries a covering 23, exert a clampingaction on the bearing 21. A shoulder 24, provided on the outer bearingrace, serves as axial stop between the bearing 21 and the sleeve 19.

In the examples according to Figs. 4 and 5, no elastic covering isrequired.

Top rolls according to the present invention are distinguished by anextremely simple manipulation in cleaning. They are carried faultlesslyby the anti-friction bearing, so that the pressure roll in operationwill not Wander oit. A certain play is maintained for the pressureroll-er with respect to the stationary axle 2, which is desirable forspinning. A special advantage is the fact that any sliding frictionbetween stationary and rotating parts is avoided. The completely encasedant-ifriction bearing alfords a maximum reliability of operation. Sinceno lbearing grease contacts the sealing elements, no dust will settlethereon and the points of sealing remain always clean. Any dust whichsomehow has passed through the sealings will be deposited in the spacebetween the bearing and the sealing element, without detriment to thebearing.

The top-roll construction according to my present invention is of simpleand cheap manufacture. These top rolls may be used to equal advantage,at any rate without any appreciable dilerence, both for top-roll axlesguided at midpoint or at their ends.

What I claim as new and desire to secure by Letters Patent is:

1. A top drawing-roll aggregate for drawing-heads of spinning frames andthe like, comprising a stationary axle having two end portions, anantifriction bearing individually connected with each of said endportions, a thinwalled sleeve adapted to be removably mounted on each ofsaid bearings, and a resilient covering immovably secured on the outersurface of each sleeve so as to form an integral structure therewith andto subject the sleeve to a radial compressive action, each sleeve havinga yieldable portion responsive to said compressive action to permit themounting and demounting of each sleeveand-covering structure onto andfrom its respective bearing, ea-ch sleeve having inwardly projectingstop means adapted to limit axial movement of the bearing in the sleeve,the whole combination being such that the said sleeve-and-coveringstructures individually may be yieldably slipped over and stripped fromthe said bearings.

2. A top-roller assembly for drawing heads, comprising a stationaryaxle, two anti-friction bearings secured on said axle, a thin-walledsleeve mounted on each of said bearings and a resilient covering securedby resilient stress on the outer surface of each sleeve, said sleeveshaving axially disposed slots, so that when mounted on the bearings thesleeves elastically grip the outer races of said bearings, and stopmeans integral with said sleeves to limit axial movement of saidbearings in said sleeves.

3. A top-roller for drawing heads of spinning frames and the like,comprising an axle, an anti-friction bearing mounted on said axle,sleeve means comprising a thinwalled sleeve member mounted on saidbearing, said sleeve member having resilient means integral therewithfor elastically gripping the bearing when the sleeve is mounted on thebearing to provide ready mounting and demounting of said sleeve onto andfrom said bearing, and stop means for limitingv axial movement of saidbearing in its sleeve.

4. A to roller for drawing-heads of spinning frames and the like,comprising a stationary axle having two closure collars spaced apart onopposite sides of the middle of said axle, an anti-friction bearingmounted on each end of said axle, two sleeve means individuallyremovably mounted on said bearings, said sleeve means individuallycomprising a thin walled sleeve member havmg closed outer ends, the saidclosure collars being located on the axle in positions to substantiallyclose the inner ends of said sleeve members, said sleeve members havingmeans to limit axial movement of said bearings in their sleeve means,and said sleeve means comprising elastic means to hold same on theirbearings.

5. A top drawing-roll aggregate for drawing-heads of spinning frames andthe like, comprising an axle, an antifriction bearing mounted on saidaxle, sleeve means mounted on said bearing, concentrically actingresilient means forming part of said sleeve means for elasticallygripping the bearing when the sleeve means is mounted on the bearing toprovide for ready mounting and .demounting of said sleeve means on andfrom said bearing, and stop means integral with and inwardly protrudingfrom said sleeve means for limiting axial movement of said bearing insaid sleeve means.

6. A top drawing-roll aggregate as set forth in claim 5, said sleevemeans comprising a thin walled sleeve member having longitudinal cutsleaving a narrow strip therebetween, said strip being yieldinglycambered inwardly of the sleeve for gripping the bearing, and said stopmeans being formed by inwardly stamped portions of said thin walledsleeve member.

'7. A top drawing-roll aggregate set fort-h in claim 5, said sleevemeans comprising a thin walled sleeve inember having radially yieldingportions, a resilient covering stretched around said thin walled sleevemember and pressing said yielding portions inwardly against the bearingfor gripping same, and said stop means being formed by inwardly stampedportions of said thin walled sleeve member.

8. A top drawing-roll aggregate as set forth in claim 5, said sleevemeans comprising a thin walled sleeve member having a corrugated portionwhose corrugations extend circumferentially of the sleeve member, theinwardly protruding crests of the corrugations gripping the bearing,said stop means being formed by a corrugation at one end of saidcorrugated portion, and said bearing having a collar axially abuttingsaid stop means.

9. A top roll for spinning machines, comprising a shaft, a bearing onsaid shaft having a cylindrical outside surface portion and a surfaceportion of gradually increasing and subsequently gradually decreasingdiameter adjacent to said cylindrical surface portion and forming anannular recess thereat, a thin wall sleeve member having axial slitsleaving circumferentially spaced narrow strips therebetween, said stripsbeing individually severed at one end from said sleeve member and havingeach an inwardly bent end portion extending into said annular recesswhen the bearing is in normal operating position, and resilient meansstretched around said sleeve member and affording outward pushing ofsaid ben-t end portions when said surface portions of graduallyincreasing and decreasing diameter are axially pushed between said endportions.

10. A top drawing-roll aggregate for drawing-heads of spinning framesand the like, comprising an axle, an anti-friction bearing mountedthereon, a thin-walled sleeve axially slidably tted on said bearing andhaving a radially yielding portion biased toward said bearing, and aresilient covering stretched around said sleeve and adapted to presssaid yielding portion against said bearing.

l1. A top drawing-roll aggregate for drawing-heads of spinning framesand the like, comprising, in combination, an axle, a sleeve, anantifriction bearing member coaxially connected with said axle, ayielding means integral with and having a portion extending into theinterior of said sleeve, a recess in said bearing member adapted toreceive said portion for yieldingly retaining said member in said sleevein a predetermined position, and a resilient covering stretched aroundsaid sleeve and adapted to press said portion against said bearing.

12. A top roll assembly for a textile machine comprising a thin-walledsleeve, a bearing adapted to be axially slipped into and out of saidsleev a covering on said sleeve, said covering being supported by saidsleeve substantially on the entire length of the covering,y said sleeveand covering forming a unitary body, a gripping means forming part ofsaid unitary body and normally yieldngly extending radially inwardlyfrom said body and projecting into the path of the bearing when thelatter is removed from said sleeve, said gripping means being pushed outof the path of the bearing when the latter is slipped into said sleeveand exerting a clenching pressure on the bearing upon reaching itsoperative position in the sleeve, the clenching pressure being producedby at least one of the ltwo constituents of said unitary body.

13. A top drawing roll for drawing-heads of spinning frames and thelike, comprising an axle, an antifriction bearing mounted thereon,cylindrical sleeve means slidably fitted on said bearing, and radiallyinwardly acting resilient means forming an integral part of said sleevemeans and elastically gripping said bearing, said sleeve meanscomprising a thin walled sleeve member having longitudinal cuts leavinga narrow strip therebetween, said strip being bent inwardly of saidsleeve member and forming said resilient means for gripping the bearing.

14. A sleeve means for a top drawing-roll having an axle and anantifriction bearing mounted for rotation therewith, said sleeve meanscomprising a cylindrical member adapted to be disposed around and snuglylit the bearing for rotation therewith, said member having a radiallyinwardly acting resilient means adapted to press against the bear-ingand to be engaged by a tightly tting resilient covering, whereby saidmember, said covering and said resilient means form a unitary bodywherein the resilient covering assists the sleeve means in producing theelastic grip around the bearing to afford free axial mounting anddemounting of said body on and from the bearing and frictionallyresisting rotation of said body on the bearing.

l5. A sleeve as set forth in claim. 14, comprising stop means inwardlyprotruding from said cylindrical member for limiting axial movement ofthe bearing in said sleeve means.

16. A sleeve means for a top drawing-roll having an axle and anantifriction bearing mounted for rotation therewith, said sleeve meanscomprising a cylindrical member adapted to be disposed around and snuglyt the bearing for rotation therewith, a tightly fitting resilientcovering stretched around said cylindrical member, said member having aradially inwardly acting resilient means adapted to press against thebearing and to be engaged by said tightly fitting resilient coveringwhereby said member, said covering and said resilient means form aunitary body wherein the resilient covering assists the sleeve means inproducing the elastic grip around the bearing to afford free axialmounting and demounting of said body on and from the bearing andfrictionally resisting rota-tion of said body relatively to the bearing.

17. A sleeve means for a top drawing roll having an axle land anantifriction bearing mounted for rotation therewith, said sleeve meanscomprising a tubular member adapted to slidably surround the bearing, aweb cut out of said member by two substantially parallel slotsterminating within said member, said web being bent toward thelongitudinal axis of said member, so as to apply pressure in radialinward direction when moved radially outward, said tubular member beingadapted to frictionally engage the entire length of the bearing and toresist rotation of said member relatively to the bearing and to affordfree axial mounting and demounting of said body on and from the bearing.

18. A sleeve as claimed in claim 17, said tubular member having an endwall integral therewith for closing one end of said tubular member.

References Cited in the le of this patent UNITED STATES PATENTS 578,705Campbell Mar. 9, 1897 933,258 Maocuaig Sept. 7, 1909 955,162 HumphreyApr. 19, 1910 1,074,505 Kempshall Sept. 30, 1913 1,377,101 Sparling May3, 1921 1,408,327 Wilson et al Feb. 28, 1922 1,474,020 Cottam et al.Nov. 13, 1923 1,526,478 Jarvis Feb. 17, 1925 2,150,796 Brouwer et alMar. 14, 1939 2,164,426 Renfroe July 4, 1939 2,367,088 Benson Jan. 9,1945 2,402,946 Brown July 2, 1946 FOREIGN PATENTS 419,823 Great BritainNov. 116, 1934

